<template>
  <div>
    <div id="app" v-for="(item, index) in arr" :key="index">
      <span>{{ item }}</span>
      <input type="checkbox" v-model="val" :value="item" />
    </div>
    <p>你选中的元素,累加的值和为:{{ add }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      val: [],
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
    };
  },
  computed: {
    add() {
      return this.val.reduce((sum, obj) => (sum += obj), 0);
    },
  },
};
</script>

<style>
#app {
  display: inline-block;
}
</style>